Carburetor



QEEZMIM W 192% Y 1 555,9mm

G. GRIFFON CARBUBETOR Filed March 31, 1924 Patented Jan. 10, 1928.

1,655,902 PATENT OFFICE.

UNITED STATES GASTON GRIII'ON, F PARIS, FRANCE.

GARBUBETOR.

Application filed March 31, 1924, Serial No. 703,283, and in FranceApril 7, 1928.

This invention relates to an improvement in carburetors, which has forits object to supply, when the engine runs with full power, a richexplosive mixture, and, in other a cases, the most economical mixture.

For this purpose, aregulating valve is arranged which is controlled bythe .throttle valve for the gas mixture, and which is arranged in such amanner that it controls in m the interior of the constant-level fuel orfloat chamber the effect of the partial vacuum which is produced by themotor in the carburetor or mixing chamber, said device being combined insuch a manner that in til the case, where the throttle valve iscompletely 0 en, this vacuum has a null or very feeble e eat in theinterior of the said constant-level fuel chamber, and that it producescontrary effect, when the throttle an valve abandons this open position.In the carburetor of the invention, the constantlevel fuel chamber whichfeeds the atomizer or nozzle is connected with the carburetor chamberthrough the intermediate means of at an orifice that opens into achamber which is open to the atmosphere and has connection with the saidcarburetor chamber by a duct branched from the latter, the opening andclosing of said duct being controlled by a sliding sleeve valve of theVenturi type which is steered by the throttle valve for the gas mixture.

According to the present invention, this sleeve valve is connected withthe throttle at valve by any kind of transmission suitable for slidingit within the carburation chamber, according to the movement which isgiven to the throttle valve and which per mite the following functions:

W (01.) When the throttle valve is closed, to connect-the carburationchamber with the constant-level fuel or float chamber in such a. mannerthat the partial vacuum produced by the motor in the carburation chambercomes to efi'ect in the constant-level fuel chamber and that the flow offuel through the nozale will be the minimum.

(2').) ion the throttle is open to inter rupt this connection betweenthe carburation W chamber and the constant-level fuel or float chamber,and, at the same time to permit an admission of supplementary orsecondary air to the carburation chamber in such a manner that at highpower run of the motor the depression or vacuum created by the mo ten inthe oarburation chamber exercises a null or very feeble effect in theconstant-level fuel chamber, and that the discharge of fuel to or flowof fuel through the nozzle, and, at the same time, the air draft or airsupply in the carburation chamber reach their maximum.

In order to make the invention clearly understood, it is, in whatfollows, described n connection with the accompanyin drawmg, which, byway of example, s owe a vertical sectional view of an embodimentthereof.

In this drawing, the constant-level fuel chamber or float chamber isdesignated by the numeral 1. This chamber is in communication through anorifice 2 and with a chamber 3 which is open to the atmosphere by a ventor duct 4 and which is connected by a duct or short pipe 5 with thecarburation chamber 6.

In the carburation chamber or mixing chamber 6 a slidin sleeve valve 7is arranged which in t e present embodiment acts, at the same time, as aregulating valve and as a diffuser or Venturi mixer, and which slideswith light friction within said chamber. This sliding sleeve valve ismechanically connected with the throttle valve 9 for the gas mixture, bymeans of levers l0 and 10 or any other suitable transmission means forlongitudinally moving said sleeve valve according to the movements ofthe throttle valve 9 for the gas mixture. This sleeve valve iscooperatively connected with the throttle valve 9 in such a manner thatit closes the duct 5 and interrupts the communication between theconstant-level fuel or float chamber and the carburation or mixingchamber 6, when the throttle is open, as it is shown in the drawing. Forthis purpose the skirt of the sliding valve 7 has an opening 12 and acertain number of openings or holes 26. In the open position of thethrottle valve 9, which is shown in the drawing, the opening or hole 12does not coincide with the duct 5, so that the latter is closed by theupper of the valve skirt 7, while the openings 26 are coinciding withthe outer openings or air inlets 27, which are arranged in the outerwall of the carburation chamber.

It will be understood that in this position the vacuum produced by themotor in the carburation or mixing chamber 6 cannot act upon in theconstant-level fuel chamber, in such a manner that the pressuredifferential between the constant level chamber and the nozzle oratomizer is maximum, and conseuently also the output of or the flow offuel t rough the nozzle.

It will be understood that the device of the invention permits in thisposition of the throttle valve, which corresponds to the H10- torworking high power, the admission of secondary air through the-openings27 and 26 of the carburation chamber and valve sleeve; this additionalair increases the quantity of the air which is admitted through thecenter opening 28 of the sleeve valve permitting a sufiicient filling ofthe cylinders when the motor works with high power.

Finally, it will be understood that when the throttle valve 9 changesits open position, the air inlets 27, will be progressively closed,while the opening or orifice 12 comes to coincide with the duct 5. Underthese conditions, the supplementary air supply is interrupted, while theconstant-level fuel chamber is placed in communication with thecarburation or mixing chamber 6, in such a manner that the partialvacuum which is produced by the motor in the carburation chamber eseffect in the constant-level fuel chamber, and that the fuel supply ofthe nozzle is reduced to the strict minimum, which is necessary in orderto assure the carburation of the air admitted through the centralopening 28 of the diffuser 7.

The most economical regulation at reduced fuel supply is obtained for agiven motor by varying the cross section of the orifice or vent 4, whichdetermines variations in the values of the partial vacuums which prevailat 3 and 1.

For this pu ose the vent or opening 4 may be equippe with a needle valveor other suitable regulating means which permits regulation of the airpassage, or it may be arranged in such a manner that it may receive afixed plug which has an orifice of predetermined cross section, andwhich may be selected from a set of plugs having orifices of different.diameter so that they can be adapted to various motors, speeds, fuels,etc.

Finally, sleeve may that it is displaced the movable diffuser or Venturior moves automatically for the above purpose by the difference of be soarranged in the carburetor the pressures, which exist on the two op 0-site faces of the diffuser or sleeve val i c which latter could bebrought to the normal or resting position by a counterweight or by sprinHaving thus fully described my invention, what I claim as new and desireto secure by Letters Patent is:

1. Carburetor for explosion motors, comprising a constant-level fuelchamber, a nozzle supplied with fuel by the fuel chamber, a carburationchamber having orifices for the admission of secondary air, a throttlevalve for the regulation of the gas mixture, a'duct adapted forconnecting the upper part of the constant-level fuel chamber with thecarburation chamber, said duct having an orifice in communication withthe atmosphere, a sleeve valve sliding in the carburation chamberadapted for controlling the opening and closing of the duct connectingthe constant-level fuel chamber with the carburation chamber and theopening and closing of the secondary air inlet openings in the saidcarburation chamber, means for controlling the movement of the sleeve bymeans of the throttle valve in such a manner that when saidthrottlevalve is closed the sleeve valve closes the secondary air inletopenings, while, at the same time, permitting communication between theconstant-level chamber with the carburation chamber, and that when thethrottle is open the sleeve valve opens the secondary air inlets, while,at the same time, it interrupts the communication between theconstant-level fuel chamber and the carburation chamber.

2. A carburetor, as above claimed, characterized in that the sleeve isconstituted by a diffuser which is sliding in the carburation chamber,and has an opening which can be brought in line with the duct connectingthe constant-level fuel chamber with the carburation chamber, and asecond series of openings adapted to control the admission of secondaryair to the carburation chamber when the duct connecting the latter withthe constant-level fuel chamber is closed.

The foregoing specification of my improvement in carburetors, signed byme this 21st day of March, 1925.

GASTON GRIFFON.

